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I found the problem. The compression release mechanism failed(which is why it was hard to crank) and some of the metal from the compression release chipped a tooth off of the cam gear(I think that's what was causing the clicking/knocking sound. Also, since the gear tooth broke off, it slipped a...

Thank you for you input! Everything was turning smoothly when I was assembling the engine.

I'm 99% sure I reinstalled it, but that is a possibility. Thanks for your input!

I'm not getting a whole lot of input. Maybe I have to figure this out by myself. I checked the valve clearance and pushrods, everything was fine. The flywheel key isn't sheared so the the spark timing is good. I guess the only thing to do now is take the oil pan/sump off and see what's going on...

It's a single cylinder.

Yes, I got a used crankshaft from eBay that came from a good running engine. It also came with the counterweight already installed. Everything spun very freely when I was assembling the engine. There was also very little play between the connecting rod and the crankshaft journal. Also, just in...

Ok, I will do that and let you know what I find. My only question is, would a bent push rod or poorly adjusted valve clearance make the whole shake and knock? Jeremy

Hi, So, I recently completely rebuilt a Briggs & Stratton 21hp platinum engine(model #: 331877-1234-B1) It had thrown a connecting rod and punched a hole through the crankcase. I ordered the parts I needed which included and connecting rod, crankcase/engine block, crankshaft, and an oil...